Learning to Program

grep

In Chapter 3, “Getting to Know Your Computer,” you learned about the command-line tool grep. At the time, I made grep seem like Find for searching multiple files at once. But grep is actually all about regular expressions (in fact, grep stands for global regular expression print). Using grep, you can search for patterns within multiple files at once. When working on a project that has a lot of files (LinkedIn has a lot of files), grep is a necessity. For example, I can search all my CSS files for places where I am using float: left; or float: right; using one grep command.